Improvement in trip-hammers



l. C., BUTTERFIELD. Trip-Hammers. N0,l53,534, PatentedJuI-y 28,1874.

UNITED STATES PATENT OFFICE.

JOHN O..BUTTERFIELD, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN TRIP-HAMMERS.

Speciiication forming part of Letters Patent N o. 153,534, dated July28, 1874; application filed January 7, 1873.

To all whom it may concern:

Be it known that I, JOHN C. BUTTEREIELD, of Chicago, in the county ofCook and State of Illinois, have invented a certain Improvement inPower-Hammers, of which the following is a specification f Thisinvention relates to that class of power-hammers which are operated by arevolving shaft through the medium of an eccentric and rod, orequivalent means, the shai't being in turn driven by a pulley and belt.My improvement consists in the employment of a connected belt-tiglitenerand automatic brake, so combined with a trcadle that the workman can,with his foot, regulate at will the speed ot' the driving-shaft, andthus govern the force of the blow struck by the hammer, as that isproportionate to its velocity.

In the annexed drawings, Figure 1 illustrates my improvement inperspective, the bed, anvil-block and anvil, and the drivingbelt beingshown iii dotted lilies. Figs. 2 and 3 are detail views, hereinaftermore particularly referred to.

The same letters of reference are used in all the igures in thedesignation of identical parts.

The driving-shaft A is placed iii bearings across the bed of the hammer,and carries at one end the rimmed pulley B, and at the other end theily-wheel O. The pulley is embraced by a slack belt, the tension oi'which is controlled by a belt-tigliteiier, l), composed of ananti-friction rimmed roller, which revolves freely on alaterally-projectin g stud of the arm E. The latter is pivoted to thevertical arni I of abell-crank lever, the horizontal arm F ot' which ispivoted to the leg G of a treadle. The arm E has at its lower end aseries of serra-tions, e, which are adapted to engage with similarserratioiis, j', on the bellcrank. lhe arm can be adjusted by tnriiiiigit on its pivot on the bell-crank, to arrange the tigliteiier in properrelation to the belt, after which it is firmly fixed to the bell-crankbya bolt, e', a segmental slot, ff, being formed in the latter to permitthe bolt to move with the arm in shifting it. The bell-crank is iixedupon the transverse horizontal shaft H, the other end of which carries abrake, I, which is automatically applied to the rim of thebalaiice-wlieel by a lever, I1, carrying an adjustable weight, I2. Theouter end of the brake is pivoted to the leg G1 of the treadle, and thearrangement of the brake and belt-tightener with reference to thedriving belt and iiywheel is such that on forcing the belt-tighteiierover against the belt the brake will be swung away from theiiy-wheel,and Vice versa. 'llle legs oi' the treadle are connected by a bow, G2,passing around the anvil-block, and they are at their extreme endspivoted upon studs g, secured to the bed ot' the hammer. These studs arevertically adjustable, so that the bow ot' the treadle can readily bearranged to suit the workman. The legs oi' the treadle are slotted, asat g', where the studs g pass through them,to provide for the endmovement of the treadle.

It is obvious that, although the employment of a compound treadle suchas described is preferable for many reasons, a simple treadle composedof a single lever, operating upon one end or the other ofthe shaft H,might be substituted.

The specialy advantages of the use of a treadle for controlling theconnected belttighteiier and brake is, that the workman can govern thestroke ot' his hammer with his foot, leaving liiin the free use of bothhands to manipulate the iron he is shaping.

What I claim as my invention, and desire to secure' by Letters Patent,is-

The combination of the balance-wheel, treadle Gr Gr1 G2, brake I, andbelt-tightener, substantially as and for the purpose set forth.

JOHN C. BUTTERFIELD.

VVitiiesseS:

N. B. SMITH, C. W. SMITH.

